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To watch TV or not
American boys and girls love to watch television.Most childrenspend eight hours a day in school and about four to six hours a day infront of the television set，Some even watch television for eight hours ormore on Saturdays and Sundays，
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American boys and girls love to watch television.Most childrenspend eight hours a day in school and about four to six hours a day infront of the television set，Some even watch television for eight hours ormore on Saturdays and Sundays，
注：“本文中所涉及到的图表、注解、公式等内容请以PDF格式阅读原文”